huberror.c

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1992 - 1997, 2000,2002-2007 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/types.h>
#include <linux/interrupt.h>
#include <asm/delay.h>
#include <asm/sn/sn_sal.h>
#include "ioerror.h"
#include <asm/sn/addrs.h>
#include <asm/sn/shubio.h>
#include <asm/sn/geo.h>
#include "xtalk/xwidgetdev.h"
#include "xtalk/hubdev.h"
#include <asm/sn/bte.h>

void hubiio_crb_error_handler(struct hubdev_info *hubdev_info);
extern void bte_crb_error_handler(cnodeid_t, int, int, ioerror_t *,
                  int);
static irqreturn_t hub_eint_handler(int irq, void *arg)
{
    struct hubdev_info *hubdev_info;
    struct ia64_sal_retval ret_stuff;
    nasid_t nasid;

    ret_stuff.status = 0;
    ret_stuff.v0 = 0;
    hubdev_info = (struct hubdev_info *)arg;
    nasid = hubdev_info->hdi_nasid;

    if (is_shub1()) {
        SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
            (u64) nasid, 0, 0, 0, 0, 0, 0);

        if ((int)ret_stuff.v0)
            panic("%s: Fatal %s Error", __func__,
                ((nasid & 1) ? "TIO" : "HUBII"));

        if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
            (void)hubiio_crb_error_handler(hubdev_info);
    } else
        if (nasid & 1) {    /* TIO errors */
            SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
                (u64) nasid, 0, 0, 0, 0, 0, 0);

            if ((int)ret_stuff.v0)
                panic("%s: Fatal TIO Error", __func__);
        } else
            bte_error_handler((unsigned long)NODEPDA(nasid_to_cnodeid(nasid)));

    return IRQ_HANDLED;
}

/*
 * Free the hub CRB "crbnum" which encountered an error.
 * Assumption is, error handling was successfully done,
 * and we now want to return the CRB back to Hub for normal usage.
 *
 * In order to free the CRB, all that's needed is to de-allocate it
 *
 * Assumption:
 *      No other processor is mucking around with the hub control register.
 *      So, upper layer has to single thread this.
 */
void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
{
    ii_icrb0_b_u_t icrbb;

    /*
     * The hardware does NOT clear the mark bit, so it must get cleared
     * here to be sure the error is not processed twice.
     */
    icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
                           IIO_ICRB_B(crbnum));
    icrbb.b_mark = 0;
    REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
             icrbb.ii_icrb0_b_regval);
    /*
     * Deallocate the register wait till hub indicates it's done.
     */
    REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
    while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
        cpu_relax();

}

/*
 * hubiio_crb_error_handler
 *
 *  This routine gets invoked when a hub gets an error 
 *  interrupt. So, the routine is running in interrupt context
 *  at error interrupt level.
 * Action:
 *  It's responsible for identifying ALL the CRBs that are marked
 *  with error, and process them. 
 *  
 *  If you find the CRB that's marked with error, map this to the
 *  reason it caused error, and invoke appropriate error handler.
 *
 *  XXX Be aware of the information in the context register.
 *
 * NOTE:
 *  Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
 *  handler can be run on any node. (not necessarily the node 
 *  corresponding to the hub that encountered error).
 */

void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
{
    nasid_t nasid;
    ii_icrb0_a_u_t icrba;   /* II CRB Register A */
    ii_icrb0_b_u_t icrbb;   /* II CRB Register B */
    ii_icrb0_c_u_t icrbc;   /* II CRB Register C */
    ii_icrb0_d_u_t icrbd;   /* II CRB Register D */
    ii_icrb0_e_u_t icrbe;   /* II CRB Register D */
    int i;
    int num_errors = 0; /* Num of errors handled */
    ioerror_t ioerror;

    nasid = hubdev_info->hdi_nasid;

    /*
     * XXX - Add locking for any recovery actions
     */
    /*
     * Scan through all CRBs in the Hub, and handle the errors
     * in any of the CRBs marked.
     */
    for (i = 0; i < IIO_NUM_CRBS; i++) {
        /* Check this crb entry to see if it is in error. */
        icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));

        if (icrbb.b_mark == 0) {
            continue;
        }

        icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));

        IOERROR_INIT(&ioerror);

        /* read other CRB error registers. */
        icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
        icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
        icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));

        IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);

        /* Check if this error is due to BTE operation,
         * and handle it separately.
         */
        if (icrbd.d_bteop ||
            ((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
              icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
             (icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
              icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {

            int bte_num;

            if (icrbd.d_bteop)
                bte_num = icrbc.c_btenum;
            else    /* b_initiator bit 2 gives BTE number */
                bte_num = (icrbb.b_initiator & 0x4) >> 2;

            hubiio_crb_free(hubdev_info, i);

            bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
                          i, &ioerror, icrbd.d_bteop);
            num_errors++;
            continue;
        }
    }
}

/*
 * Function : hub_error_init
 * Purpose  : initialize the error handling requirements for a given hub.
 * Parameters   : cnode, the compact nodeid.
 * Assumptions  : Called only once per hub, either by a local cpu. Or by a
 *          remote cpu, when this hub is headless.(cpuless)
 * Returns  : None
 */
void hub_error_init(struct hubdev_info *hubdev_info)
{

    if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
            "SN_hub_error", hubdev_info)) {
        printk(KERN_ERR "hub_error_init: Failed to request_irq for 0x%p\n",
            hubdev_info);
        return;
    }
    irq_set_handler(SGI_II_ERROR, handle_level_irq);
    sn_set_err_irq_affinity(SGI_II_ERROR);
}


/*
 * Function : ice_error_init
 * Purpose  : initialize the error handling requirements for a given tio.
 * Parameters   : cnode, the compact nodeid.
 * Assumptions  : Called only once per tio.
 * Returns  : None
 */
void ice_error_init(struct hubdev_info *hubdev_info)
{

        if (request_irq
            (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
             (void *)hubdev_info)) {
                printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
                       hubdev_info);
        return;
    }
    irq_set_handler(SGI_TIO_ERROR, handle_level_irq);
    sn_set_err_irq_affinity(SGI_TIO_ERROR);
}